And while Michael left Deangelo Vickers (played by Will Ferrell) in charge, rumor has it that Ferrell will not return after this season's finale.

But Carell is far from the first star to quit a still-popular TV show. From Shelley Long leaving "Cheers" to Anthony Edwards' character dying on "ER," let us know: What was the most bittersweet TV goodbye of all time?